Insertable saw tooth for circular-saw blades



Nov. 23 1926.

J. PosPlEcfl-l INSERTABLE SAW TOOTH FOR OIRGULAR SAW BVLADES Filed April 20, 1926 Attorney Patented Nov. 23, i925.

JOSEF PGSPIE'OI-'L GE MCSSXBE, ALBERTA, CANADA.

Application filed April 20,

T ie present invention relates to improvements in circular saw blades and has reference more particularly to one wherein an insertable saw tooth is adapted to be associated therewith.

@ne ot the important objects of the presont invention is to provide a circular' saw blade which is provided with a socket tor receiving the saw tooth, neans being provided :For locking` the tooth in position in the socket against accidental displacement therefrom.

Another important object ofthe invention is to provide a structure of the above inentioned character which will not add to the circumferential strain ot the saw blade when the latter is rotated, at a relatively great speed.

A, further obieet is to provide an insertable saw tooth ror a circular saw blade which may be readily and easily inserted or rcnioved without the loss'ot any considerable length of time or labor.

Another important obj ect of the-invention is to provide a circular saw blade and an inser-table tooth there'lior which is simplein` construction, inexpensive, strong and durable, and further well adapted to the purpose for which it is designed.

@ther objects and advantagesotthe invention will become apparent during the course ot the following description taken in connection with the accompanying drawing.

ln the accompanying drawing forming a part ot this application and in which like numerals designate lil-:e parts throughout the several views:

Figure l is a fragmentary side elevation ot a Acircular saw blade showingmy improved saw tooth secured in the socket provided therefor in the blade.

Figure 2 is a sectional.' view taken approximately on line 2 2 of Figure l looking in the direction of the arrows.

Figure 3 is an enlarged detail of the locking member for the tooth, the curvature o'i` its outline being exaggerated tor the purpose ot illustration.

Figure 4 is a detail perspective view of the. wedge forming a part ot the present invention, and

Figure 5 is a view similar to Figure l showing the inodiiication of the tooth securing means.

In the drawing wherein for the purpose of illustration is shown the preferred em- BLADES! Serial No. H3305'.

bodiment oi" my invention, thenuineral l lesignates the circular saw blade, the saine eing provided with a partially arcuate` naped anda partially straight cut outi porion or-socket 2 which extends inwardly troni he edge of the blade at a point adjacent dust gullet 3, thereby forming .a prong i shoulder l extendsvinto the socket or cut out portion 2 from the concaved-side wall et the socket at the intermediate portion thereot and this shoulder' eis provided with the notched or cut out portion in the manner. as is clearlyY shown in 1iTigurel of' the drawing. f

rllhe insertable saw tooth Vforming a partv ot' the present invention is designated generally by the numeral (3 and is substantiallyT arcuate-in design to contorni to theshape ot the socket formed in thecircular blade l. rlhe convex edge of the insertablesaw tooth G is provided with the substantially V- shaped groove 7, the same being adapted for cooperation with the substantially irl-shaped edge 8 formed in the comaved wall ot the socket 2. This construction is clearly shown in Figure 2 ot the drawing.

fr lip or tongue l5 is termed on the lower end oi the convenv side ot the insertable saw tooth 6 and is adapted to be received within the notched or cut out portion 5 provided therefor in the inwardly extending shoulder 4t. ln this manner, the inner end ot the in# sertable saw tooth is maintained in proper position within the intermediate portion ot the socket formed in the circular saw blade l.

Theeoacting V-shaped portions 7 and 8 oi the saw blade l and the socket` 2 respectively provide a means whereby the saw tooth may be guided during the sliding` movement when inserting er reinovingthe tooth with respect to the socket.

For the purpose oi locking the insertab'le saw tooth 6 in position within the socket 2, the concave edge of the lower or inner por-v` tion of the tooth 6 and the adjacent or conveX edge of the prong 11i have formed therein, the complementary notches 9 and 10 respectively. The locking means per se comprises a relatively short pin 11, which is of a length slightly greater than the Width of the saw blade l and the tooth 6. It is of course to be understood that the tooth is ot substantially the same thickness as the saw blade. The construction of the locking pin is clearly shown in Figures 2 and 3 of the drawing, and it will be noted that the pin is compressed in the intermediate portion or middle thereof so that the same gradually increases in diameter from its center toward its outer end. By constructing a locking pin in the manner shown and above described, it will be impossible` tor the pin to become accidentally disengaged from the complementary notches 9 and l0 which are reamed to conform to the outline ot the locking pin 1l when properly positioned between the concave edge of the tooth 6 and the convex edge ot the prong la.

The manner in `which the locking pin is inserted or removed will now be described. A substantially rectangular shaped opening l2 is formed in the convex edge ot the prong V14; adjacent the outer end thereoiQ and a similar shaped wedge 13 such as is shown in Figure l is adapted to be driven into the opening l2 so that the opposite sides ot the wedge will engage the convert wall et the socket 2 and the coneaved edge oi the tooth 6 after the tooth has been inserted within the socket so as to cause a slight spreading action to take place between the prong l and the insertable tooth 6.

The spreading action is sut'iicient to permit the locking pin ll to be inserted between the.complementary notches 9 and 'LO termed in the concave edge ct the and the convened wall ot the socket 2 respectively. llfhen the wedge 13 is removed -i'reni between the concave edge or the tooth (3 and the convex wall ot the socket 2, the resiliency ot the prong as well as the tooth will cause the elements to swing back to their normal positions so that the pin 1l will be held in locked engagement with the complementary notches S) and l0, thus securing the tooth against accidental displacement trom the socket in the saw blade.

l/Vhile l have shown a substantially circular shaped pin as the preferred torni ot the locking device, it is to be understood that locking pins et other shapes may he substituted, and as is illustrated in Figure `5, the locking pin shown therein is substantially rectangular in design. lt is to be understood that the intermediate portion ot the locking pin is reduced so that the locking pin cannot become dislodged from the complementary notches 9 and l0.

Also it desired, a screw threaded locking tooth pin may be employed, it being understood ot course that the complementary notches 9 and l() will also be threaded to cooperate with the threads ot such a locking pin.

lt will thus be seen from the foregoing description, that I have provided a novel yet simple means for locking an insertable saw toothin a circular saw blade, and the simplicity in which the parts are arranged enables the same to be readily and easily accessible tor inserting or removing the tooth from the blade.

ldfhile l have shown the preferred embodiment et my invention, it is to be understood that minor changes in the size, shape, and arrangement et parts may be resorted to without departing 'from the spirit of the invention and the scope ot vthe appended claims. i

Having thus described the invention, what l claim as new and desire to secure by Letters Patent is z- 1. The combination with a circular saw blade provided with a socket which extends inwardly 'from the edgeof the blade at a point adjacent the usual saw dustV gullet whereby a prong is formed, a shoulder eX- tending into the socket trom one side there et, said shoulder having a notch formed in the upper portion thereof, ot a saw tooth slidahly fitted in the socket, a tongue formed in the inner end ot the tooth and adapted to lit in said notch, and means for securing the tooth against accidental displacement trom the socket.

il. The combination with av circular sawV blade provided with a socket which extends inwardly from the edge of the blade at a point adjacent the usual saw dust gullet whereby a prong is formed, a shoulder extending into the socket from one side thereet, said shoulder havingv a notch formed in the upper portion thereof, ot a saw tooth slidably tted in the socket, a tongue termed in the inner end of thetooth and adapted to lit in said notch, means 'for securing the tooth against accidental displacement from the socket, said means comprising a locking pin disposedy transversely between the adjacent side edges ot the tooth and said prong.

ln. testimony whereof I atlix my signature.

JOSEF POSPIECH. 

